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There are few who will be surprised that 2017 Nitto ATP Finals champion Grigor Dimitrov is into the quarter-finals at the Australian Open . After making his mark at Melbourne Park in 2017 in an epic five-setter in the semi-finals against Rafael Nadal , the Bulgarian went on to have a career season on the ATP World Tour, winning his first ATP World Tour Masters 1000 title in Cincinnati, triumphing...